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CVE-2021-36934 (GCVE-0-2021-36934)

Vulnerability from cvelistv5 – Published: 2021-07-22 07:05 – Updated: 2026-08-10 15:11
VLAI CISA Previdian
Title
Windows Elevation of Privilege Vulnerability
Summary
An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:T/RC:C
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 18:15 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.2114 (custom)
guessed Create a notification for this product.
Microsoft Windows 10 Version 1809 Affected: 10.0.0 , < 10.0.17763.2114 (custom)
guessed Create a notification for this product.
Microsoft Windows 10 Version 1909 Affected: 10.0.0 , < 10.0.18363.1734 (custom)
guessed Create a notification for this product.
Microsoft Windows 10 Version 2004 Affected: 10.0.0 , < 10.0.19041.1165 (custom)
guessed Create a notification for this product.
Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.1165 (custom)
guessed Create a notification for this product.
Microsoft Windows 10 Version 21H1 Affected: 10.0.0 , < 10.0.19043.1165 (custom)
guessed Create a notification for this product.
Date Public
2021-07-20 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 980bf297-4b65-4417-93e5-bb8927280add

Vulnerability ID: CVE-2021-36934

Status: Confirmed

Status Updated: 2022-02-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-02-10
Asserted: 2022-02-10
Scope
Notes: KEV entry: Microsoft Windows SAM Local Privilege Escalation Vulnerability | Affected: Microsoft / Windows | Description: If a Volume Shadow Copy (VSS) shadow copy of the system drive is available, users can read the SAM file which would allow any user to escalate privileges to SYSTEM level. | Required action: Apply updates per vendor instructions. | Due date: 2022-02-24 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-36934
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-1220
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2022-02-24
Date Added 2022-02-10
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows SAM Local Privilege Escalation Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 16a888c6-c798-421b-8e31-1545ccf4b5d4

Vulnerability ID: CVE-2021-36934

Status: Confirmed

Status Updated: 2022-02-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-02-10
Asserted: 2022-02-10
Scope
Notes: KEVIntel entry: Windows Elevation of Privilege Vulnerability | Affected: Microsoft / Windows 10 Version 1809, Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows 10 Version 20H2 | CVSS: 7.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Windows Elevation of Privilege Vulnerability
Vendor Microsoft
Product Windows 10 Version 1809, Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows 10 Version 20H2
Added Date 2022-02-10T00:00:00.000Z
Cvss Score 7.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "initial_release_date": "2021-07-20T07:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Windows Elevation of Privilege Vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-36934.json",
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  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.